CN104111131A - Reinforced concrete structure stress in situ online monitoring method - Google Patents
Reinforced concrete structure stress in situ online monitoring method Download PDFInfo
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- CN104111131A CN104111131A CN201410161590.6A CN201410161590A CN104111131A CN 104111131 A CN104111131 A CN 104111131A CN 201410161590 A CN201410161590 A CN 201410161590A CN 104111131 A CN104111131 A CN 104111131A
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Abstract
The invention discloses a reinforced concrete structure stress in situ online monitoring method. A sensor is pre-embedded in a concrete member. Pole direction of the sensor is consistent with detected stress direction. The sensor is used for receiving electrical signals generated by concrete stress variations. The sensor is connected through a shielded wire with a stress monitoring system which is used for recording stress monitoring information. According to the reinforced concrete structure stress in situ online monitoring method, the sensor is pre-embedded in the concrete member. The sensor can exclude influence of external factors and stress variation conditions of the concrete member are monitored accurately. The method provided by the invention is simple to operate, can be used to realize in situ, real-time and online monitoring of stress-time of the concrete structure, and is of great significance for experimental research of concrete.
Description
[technical field]
The present invention relates to concrete component monitoring, relate in particular to a kind of reinforced concrete structure stress original position on-line monitoring method.
[background technology]
Along with improving constantly that the continuous appearance of the Important buildings such as skyscraper, large-span space structure, Very Large Bridge and people require civil engineering structure safety in utilization, comfortableness, the research of large scale structure health monitoring systems has become a study hotspot of field of civil engineering.Structural healthy monitoring system is to avoiding personnel's property loss, reduce structural repair expense and extending structure life-span, guaranteeing structure durability and practicality important in inhibiting.
Existing stress in xoncrete structure is one of most important index of reflection total situation.Owing to there being many factors that cannot be definite in xoncrete structure construction and use procedure, as construction error, construction mistake, concrete creep, loss of prestress etc., cause concrete stress and theoretical analysis result in structure to have different, this just makes theoretical calculating cannot draw the true internal force of structural concrete.The general method loading step by step that adopts of traditional structural experiment method, the displacement that tested object is member and surface strain, then extrapolate accordingly stress.The problem that these class methods exist is to realize the in-situ monitoring that the non-load factor that structure is produced in long-term use procedure causes extra internal force.Therefore, a kind of method that can more directly measure component stress state need to be proposed.
At present, the power sensor of monitoring concrete stress mainly contains mechanical type and electric measuring type two classes, the ultimate principle of these sensors is to remove esthesis with flexible member, there is to become with external force the distortion of corresponding relation in flexible member, with mechanical hook-up, these distortion are amplified and demonstration is mechanical sensor by rule, with strain ga(u)ge these distortion change into resistance variations and then measure be strain gauge transducer, the piezoelectric transducer that utilizes in addition piezoelectric effect to make.But, no matter be mechanical type or electric measuring type sensor, be all that sensor is placed in to tested body surfaces, sensor is subject to external factor impact, STRESS VARIATION situation that cannot monitor concrete component, this is particularly evident for the stress monitoring impact in the long-term use procedure of structure.
[summary of the invention]
The technical problem to be solved in the present invention is to provide the reinforced concrete structure stress original position on-line monitoring method that a kind of monitoring effect is good, contribute to improve the detection technique level of existing structure performance, for component internal force in Practical Project definite provides a kind of new means.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is, a kind of reinforced concrete structure stress original position on-line monitoring method, sensor is embedded in concrete component, sensor electrical extreme direction is consistent with surveyed stress direction, for converting concrete STRESS VARIATION to electric signal, sensor connects stress monitoring system by shielding line, and stress monitoring system is used for recording stress monitoring information.
Above-described reinforced concrete structure stress original position on-line monitoring method, sensor is flush type 1-3 type cement base piezoelectric ceramic composite sensor.
Above-described reinforced concrete structure stress original position on-line monitoring method, stress monitoring system is the electrical signal collection system of the U.S. NI-USB6008 of En Ai company data collecting card.
The present invention is embedded into reinforced concrete structure stress original position on-line monitoring method sensor in concrete component, sensor can be got rid of the impact of external factor, the STRESS VARIATION situation of monitor concrete component, the present invention is simple to operate, can realize the original position of xoncrete structure stress time-histories, real-time and online monitoring, to carrying out concrete test research, have great importance.
[accompanying drawing explanation]
Below in conjunction with figure and embodiment the present invention is further detailed explanation.
Fig. 1 a is the structural representation of the embodiment of the present invention 1.
Fig. 1 b is that A in Fig. 1 is to cut-open view.
Fig. 2 a is the perspective view of the embodiment of the present invention 1 sensor.
B in Fig. 2 b Fig. 2 a is to cut-open view.
Wherein, 1, sensor, 2, concrete, 3, shielded lead, 4, monitoring system, 5,1-3 type cement base piezoelectric composite material, 6, polymkeric substance/cement encapsulating material
Fig. 3 a is the floor plan schematic diagram of sensor in the embodiment of the present invention 1 beam
Fig. 3 b is that the facade of sensor in the embodiment of the present invention 1 beam is arranged schematic diagram.
Fig. 4 is the frequency response characteristic of cement base piezoelectric composite material of the present invention.
Fig. 5 is the embodiment of the present invention 1 beam linear properties test result.
Wherein, Fig. 5 a is stress-load curve that 30cm place loads different sensors; Fig. 5 b is stress-load curve that diverse location loads 2# sensor.
Fig. 6 is monitoring result under Impact Load in the embodiment of the present invention 2 beams.
Wherein, Fig. 6 a is that diverse location loads longitudinal distribution sensor experimental result, and Fig. 6 b is that diverse location loads the sensor experiment result that diagonally distributes.
Fig. 7 is that in the embodiment of the present invention 2 beams, part cyclic loading loads lower test result.
Wherein, Fig. 7 a is that 1/2 position loads 1# sensor experiment result, and Fig. 7 b is that 1/4 position loads 7# sensing station experimental result.
Fig. 8 is longitudinal distribution sensor monitoring result under Reversed Loading in the embodiment of the present invention 2 beams.
Wherein, Fig. 8 a is diverse location 5Hz loading experiment result, and Fig. 8 b is 1/2 position different frequency loading experiment result.
Fig. 9 is oblique distribution sensor monitoring result under Reversed Loading in the embodiment of the present invention 2 beams.
Wherein, Fig. 9 a is the contrast of diverse location 30Hz loading experiment result, and Fig. 9 b is 1/2 position different frequency loading experiment result.
Figure 10 is the experimental result that in the embodiment of the present invention 3 beams, 1/2 position different frequency loads 1# sensor.
Wherein, Figure 10 a is 5Hz loading experiment result, and Figure 10 b is 10Hz loading experiment result, and Figure 10 c is 20Hz loading experiment result, and Figure 10 d is 30Hz loading experiment result.
Figure 11 is the schematic diagram of layouting of sensor in the embodiment of the present invention 4 frameworks.
Figure 12 is the embodiment of the present invention 4 reinforced concrete frame loading position schematic diagram.
Figure 13 is the embodiment of the present invention 4 framework neutral line performance tests.
Wherein, Figure 13 a is that A80 position loads the stress of diverse location sensor with the variation of input load, and Figure 13 b is that diverse location loads the stress of 6# sensor with the variation of input load.
Figure 14 is experimental result under Impact Load in the embodiment of the present invention 5 frameworks.
Wherein, Figure 14 a is the experimental result that H position loads 8# sensor, and Figure 14 b is the experimental result that H position loads 9# sensor.
Figure 15 is part monitoring result under Reversed Loading in the embodiment of the present invention 5 frameworks.
Wherein, Figure 15 a is the experimental result that A80 position 5Hz loads 10# sensor, and Figure 15 b is the experimental result that H position 5Hz loads 8# sensor.
Figure 16 is the Sensor monitoring result that in the embodiment of the present invention 5 frameworks, diverse location applies impact load.
Figure 17 is stress monitoring experimental result under diverse location loading cycle load action in the embodiment of the present invention 5 frameworks.
Wherein, Figure 17 a is experiment and the analog result that A1 position 5Hz loads 2# sensor, and Figure 17 b is experiment and the analog result that A80 position 5Hz loads 7# sensor.
Figure 18 is stress monitoring experimental result under Reversed Loading in the embodiment of the present invention 5 frameworks.
Wherein, Figure 18 a is load sensor monitoring result under diverse location 5Hz, and Figure 18 b is A1 position load sensor monitoring result under different frequency, and Figure 18 c is A80 position load sensor monitoring result under different frequency.
Figure 19 is that in the embodiment of the present invention 6 frameworks, A80 position different frequency loads lower 13# sensor experiment result.
Wherein, Figure 19 a is the experimental result that A80 position 5Hz loads 13# sensor, Figure 19 b is the experimental result that A80 position 10Hz loads 13# sensor, and Figure 19 c is the experimental result that A80 position 20Hz loads 13# sensor, and Figure 19 d is the experimental result that A80 position 30Hz loads 13# sensor.
[embodiment]
Below by specific embodiment, the present invention will be further elaborated, should be understood that, following explanation is only in order to explain the present invention, particular content not to be limited.
With reference to Fig. 1, in this xoncrete structure stress in-situ monitoring method, need sensor 1, according to monitoring requirements, determine respectively monitoring point placement sensor 1, sensor is as in coarse aggregate Transducers Embedded in Concrete member 2, sensor electrical extreme direction is consistent with surveyed stress direction, and for receiving piezoelectric signal, sensor 1 is drawn by shielding line 3 respectively, to monitoring system 4, monitoring system 4 is for recording stress monitoring information.Sensor 1 is flush type 1-3 type cement base piezoelectric ceramic composite sensor, and its structure as shown in Figure 2.Stress monitoring system 4 is the electrical signal collection system based on the U.S. NI-USB6008 of En Ai company data collecting card.
The using method of this xoncrete structure stress in-situ monitoring method is: in the concrete component 2 when strain gauge 1 is imbedded to building, strain gauge 1 electrode direction is consistent with wanted monitor stress direction.Monitoring for unknown stress direction in engineering application, can form sensor array by a plurality of strain gauges, to obtain all directions stress.During monitoring, each sensor 1 receives respectively concrete stress and changes the electric signal producing, by shielding line 3, connect the stress monitoring system 4 based on NI-USB6008 data collecting card, according to the electric signal receiving, determine the stress intensity in xoncrete structure, observe its development tendency simultaneously.
Below in conjunction with embodiment, the stress in-situ monitoring method the present invention relates to is described in detail, but not as limitation of the present invention.
Embodiment 1:
Adopt xoncrete structure stress in-situ monitoring method involved in the present invention, to three, be of a size of the linear properties that 100mm * 100mm * 1200mm reinforced beam carries out the sensor under Impact Load and test.The present invention's 1-3 type used cement base piezoelectric composite material sensor construction schematic diagram as shown in Figure 2, wherein, 5 is 1-3 type cement base piezoelectric composite material, by PZT-51 piezoelectric ceramics (Baoding grand several equipment factory produces), by cutting-completion method, be prepared from, its final size is 10mm * 10mm * 1.5mm; 6 is polymkeric substance/cement encapsulating material, and wherein polymkeric substance is AB-grouting resin, and cement is Portland cement, and the mass ratio of polymkeric substance and cement is 1:1.The quality mixture ratio of beams of concrete is cement: water: sand: stone: retardant=1:0.49:1.65:2.19:0.009, sensor burying underground as shown in Figure 3 in beam, in experiment according to monitoring requirements placement sensor as required, the present embodiment is because being the test of sensor stress monitoring feasibility, therefore respectively in diverse location, different buried depth place placement sensor, monitoring result is is the stress of piezo-electricity composite material thickness direction perpendicular to electrode direction.
First prepared three cube concrete test specimens that the length of side is 100mm, built-in strain gauge, to record the electromechanical conversion coefficient of sensor in structure, is determined the power-electric transformational relation of sensor by electromechanical conversion coefficient.In experiment, loading force is 1MPa, and cement base piezoelectric composite material frequency response curve as shown in Figure 4.
For reinforced beam, apply the impact load of amplitude from 1000N to 3500N, impact load applies from differing heights free-falling by the dumbbell of heavy 7.26kg, 3 samples of every group of data acquisition, average, by overcoat square steel tube, guarantee the circuit that falls, reduce load and apply contingency.For the signal collecting under different loading conditions, first carry out denoising, get measured signal peak value, by dynamoelectric signal, be converted to stress, as the stress data under load application.Respectively linear properties, the same position sensor along beam length direction diverse location sensor in reinforced beam discussed to the linear properties under diverse location loading effect and along the linear sensor performance of the different depth of buryings of beam length direction same position, output voltage signal amplitude is converted into the relation between stress value and input load amplitude, and beam linear properties test result as shown in Figure 5.As can be seen from Figure 5 in reinforced beam, between the cement base piezoelectric composite material stress that sensor is surveyed of diverse location and suffered impact load, there is good linear relationship, shown good linear properties.
Embodiment 2:
Adopt xoncrete structure stress in-situ monitoring method involved in the present invention, the beams of concrete in embodiment 1 is carried out to the piezoelectric property test under impact load and Reversed Loading.Cyclic loading is applied by electric pick, and loading frequency is respectively 5Hz, 10Hz, 20Hz, 30Hz, and the amplitude of semisinusoidal cyclic loading is 10000N, together with electric pick is strapped in structure with belt, to guarantee to load stability.The piezoelectric property of cement base piezoelectric composite material sensor in reinforced concrete structure is the key that this sensor is applied in reinforced concrete structure.For this example of piezoelectric property, mainly by the monitoring result under impact load and cyclic loading, study.In order to study the piezoelectric property of cement base piezoelectric composite material sensor compressive region and tensile region in reinforced beam, along beam length direction diverse location, applying impact load respectively, monitoring result is as shown in Figure 6.Cyclic loading experiment to different frequency, is divided into longitudinal distribution sensor group by all experimental datas and the sensor group that diagonally distributes is discussed, and monitoring result as shown in Figure 7.
In Fig. 6 (a), can find out, along beam length direction diverse location, carry out impact load loading, be positioned at often a pair of (1 of neutral axis symmetric position
#with 2
#, 3
#with 4
#, 5
#with 6
#) Monitoring Data of cement base piezoelectric composite material sensor is numerically very approaching.Cement base piezoelectric composite material sensor experiment data and the stressed size variation trend of sensor have kept good consistance simultaneously, along beam length direction same position tensile region and compressive region, are all showing good piezoelectric property.From Fig. 6 (b), can find out that cement base piezoelectric composite material sensor group numerically presents the large variation tendency in middle little both sides, results change trend is more consistent.Show cement base piezoelectric composite material sensor can impact load action under the axial stress of each position of reinforced beam effectively monitor.
Shown in Fig. 7 (a), along beam length direction 1/2 position, load 1# sensor experiment result, the signal period of sensor is 0.2s, the amplitude of sensor signal remains on 3.25MPa, does not occur the variation of larger amplitude.By Fig. 7 (b), for 1/4 position 5Hz, loaded the experimental result of lower 7# sensor, the signal period is 0.2s, and the amplitude of sensor signal remains on 1.4MPa, also there is no to occur the variation of larger amplitude.Result shows along beam length direction diverse location, applying the cyclic loading of different frequency, the experimental result of cement base piezoelectric composite material sensor is keeping well periodically, and the cycle is consistent with loading cycle, along with the passing of load time, the amplitude of sensor signal changes little.
Therefore, only get the peak stress of sensor experiment data, to facilitate longitudinally and the contrast of each sensor signal that diagonally distributes.At diverse location, load respectively the semisinusoidal cyclic loading that different frequency is, result as shown in Figure 8, Figure 9.By Fig. 8 (a), can be found out, be positioned at often a pair of (1 of neutral axis symmetric position
#with 2
#, 3
#with 4
#, 5
#with 6
#) very approaching on the numerical value of cement base piezoelectric composite material sensor.From Fig. 8 (a), 9 (a), basically identical to the experimental result variation tendency under the identical loading frequency of diverse location, and institute has kept good consistance between stressed.From Fig. 8 (b), 9 (b), can obtain, the experimental result loading under same position different frequency is basically identical, shows that the impact of frequency shift counter stress monitoring result is less.These presentation of results cement base piezoelectric composite material sensors can effectively be monitored the stress time-histories of each position of reinforced beam under different frequency Reversed Loading, have shown good piezoelectric property.
Embodiment 3:
Adopt xoncrete structure stress in-situ monitoring method involved in the present invention, the beams of concrete in embodiment 1 is carried out to the frequency response test under different frequency Reversed Loading.The frequency response of sensor is one of important performance of survey sensor dynamic response.The present embodiment is in loading procedure, keeping the amplitude of the sinusoidal load of input is that 10000N is constant, change the frequency of input load, input respectively 5Hz, 10Hz, 20Hz, 30Hz, this frequency is included in the frequency range (0.1Hz-40Hz) that comprises civil engineering structure vibration generation, carrys out the frequency response of testing sensor.The voltage waveform that sensor produces is scaled stress, and the stress time curve result of operative sensor as shown in figure 10.As seen from Figure 10, under the semisinusoidal load of different frequency, cement base piezoelectric sensor all can produce the semifocal chord voltage waveform of standard, and frequency response performance is good, illustrates that cement base piezoelectric composite material sensor all can effectively monitor different frequency cyclic loading.
Embodiment 4:
Adopt xoncrete structure stress in-situ monitoring method involved in the present invention, carry out the linear properties test of framed structure under Impact Load.Make a compound steel reinforced concrete framework, be of a size of 1000mm * 800mm * 1500mm, floor height is 500mm, and entity height is 1550mm, and the sectional dimension of beam and column is all also 100mm * 100mm, and in framework, vertical muscle and stirrup are weldingly connected.In three layers of framework, be furnished with altogether 15 piezoelectric sensors, at the point midway of six roots of sensation beam, along beam axis direction, bury respectively a sensor underground, the face of sensor is parallel to the cross-wise direction of beam to measure the axial stress of beam, is respectively 7
#-12
#sensor.On pillar, the mid point of each node location and every one deck is along post axis direction placement sensor, and the face of each sensor is parallel to the cross-wise direction of post with the axial stress of measurement column, is respectively 1
#-6
#sensor.The cross-wise direction that sensor of Nodes is parallel to 1000mm beam on pillar is placed the axial stress that test is parallel to beam, is respectively 13
#-15
#sensor.The position of sensor in framework as shown in figure 11.
The impact frame that dangles that impact load is made different radii by the dumbbell of heavy 7.26kg applies, and load amplitude is 4788N, 5472N, 6156N, 6840N, 7524N, 8208N respectively.In order to guarantee iron staff bottom drop point, at shock point, mark target location, reduce the contingency that impact load applies.3 samples of every group of data acquisition, average.For the signal collecting under different loading conditions, first carry out denoising, get measured signal peak value, by dynamoelectric signal, be converted to stress, as the stress data under load application.The loading position schematic diagram of load on reinforced concrete frame as shown in figure 12.12 load(ing) points lay respectively at the node (A1, A80, J1, J80) of framework, on the mid point (I1, I80, R1, R80) of the mid point (E, H, N, Q) of beam, pillar.Respectively the linear properties of diverse location sensor in reinforced concrete frame, same position sensor are discussed to the linear properties under diverse location loading effect, the voltage signal amplitude that Figure 13 has provided output is converted into the relation between stress value and input load amplitude.As can be seen from Figure 11 the voltage signal amplitude of output is converted between stress value and input load amplitude and has obvious linear relationship, and in reinforced concrete frame, the cement base piezoelectric composite material sensor of diverse location all shows good linear properties.
Embodiment 5:
Adopt xoncrete structure stress in-situ monitoring method involved in the present invention, the framed structure in embodiment 4 is carried out to the piezoelectric property test under different impact loads and Reversed Loading.Cyclic loading is applied by electric pick, and loading frequency is respectively 5Hz, 10Hz, 20Hz, 30Hz, and the amplitude of semisinusoidal cyclic loading is 10000N, together with electric pick is strapped in structure with belt, to guarantee to load stability.
The piezoelectric property of cement base piezoelectric composite material sensor in reinforced concrete structure is the key that this sensor is applied in reinforced concrete structure.For this example of piezoelectric property, by the monitoring result under impact load and cyclic loading, study.To being embedded with the reinforced concrete frame of cement base piezoelectric sensor, at diverse location, apply impact load and cyclic loading, the sensor in framework is discussed respectively by sensor group and the measurement beam axial stress sensor group of measuring axial stress on pillar.
In framed structure, on pillar, axial stress is the important parameter that characterizes framed structure state, and the axial stress of Vierendeel girder is as the important parameter of each layer state in structure.Under different load actions, only have when the installation position of sensor and loading position in same layer and the beam axial stress direction of surveying when identical with loading direction, the stress of monitoring point just can be obvious.When loading position is on node and when load direction is vertical with stress direction that sensor is surveyed, in experiment, the stress signal of the sensor of place beam is very small, and the order of magnitude of experimental result does not also reach the minimum of sensor can measured value.Partial results, as shown in Figure 14, Figure 15, can find out, the stress curve of sensor experiment is concussion back and forth up and down in 0 position, and the order of magnitude of monitoring result does not also reach the minimum of sensor can measured value.Therefore, when the axial stress of beam is discussed, only discuss with loading position in same layer and the axial stress direction of the surveying sensor identical with loading direction.
In order to test cement base piezoelectric composite material sensor, apply the Monitoring Performance of each monitoring point axial stress in Impact Load underframe in frame joint position, each position on framework is applied to impact load, monitoring result as shown in figure 16.Experimental result at diverse location loading cement base piezoelectric composite material sensor presents the trend increasing gradually generally from top to bottom as seen from Figure 16, and the experimental result of cement base piezoelectric composite material sensor is consistent with each point actual loading situation.Illustrate cement base piezoelectric composite material sensor can impact load action under the stress of diverse location on reinforced concrete frame effectively monitor, shown good piezoelectric property.
In order to test cement base piezoelectric composite material sensor, in frame joint position, apply the Monitoring Performance of each monitoring point axial stress on Reversed Loading underframe center pillar and beam, diverse location on framework is applied to cyclic loading, each measuring point on framework is monitored.Stress curve for each point on different loading environment lower props and beam all presents very regular periodicity, as shown in figure 17.2
#the stress curve cycle of the measured experimental data of sensor is 0.2s left and right, and the amplitude of three groups of stress time curve is all in 0.25MPa left and right, to loading position, in the experimental result of A80 position 5Hz load sensor, be to be all the half-sinusoid of 0.2s in the cycle, amplitude is all in 0.45MPa left and right, all present identical curve form, along with the passing of load time, the amplitude of sensor signal changes little.
Because the stress of each monitoring point on framework presents identical cycle and curve form, for the variation tendency of convenient research each sensor points stress on cyclic loading underframe, to get the peak value of each experimental data and analyze, partial results is as shown in figure 18.The experimental result that can find out cement base piezoelectric composite material sensor presents the trend increasing gradually generally from top to bottom, and sensor measured data has kept good consistance with stressed size variation trend.Illustrate that cement base piezoelectric composite material sensor can effectively monitor the axial stress on reinforced concrete frame under different frequency Reversed Loading, shown good piezoelectric property.
No matter be under impact load or Reversed Loading, on post, the variation of each point peak stress presents and more approaches the trend that base of frame peak stress is larger.On post, the extreme value of each point peak stress often appears near position node location or node below, and on the pillar above loading position, the stress peak of each monitoring point will, much smaller than the stress peak in each monitoring point of loading position, coincide better with actual conditions.Show that the monitoring of the stress time-histories under impact load and Reversed Loading has shown good sensing capabilities to cement base piezoelectric composite material sensor to reinforced concrete frame structure.
Embodiment 6:
Adopt xoncrete structure stress in-situ monitoring method involved in the present invention, the framed structure in embodiment 4 is carried out to the frequency response test under different loading frequency Reversed Loadings.The frequency response of sensor is one of important performance of survey sensor dynamic response.This example is in loading procedure, and keeping the amplitude of the sinusoidal load of input is that 10000N is constant, changes the frequency of input load, is followed successively by 5Hz, 10Hz, 20Hz, 30Hz.The voltage waveform being produced by cement base piezoelectric sensor is scaled stress, and part of test results as shown in figure 19.As seen from the figure, under the semisinusoidal load of different frequency, cement base piezoelectric sensor all can produce the semifocal chord voltage waveform of standard, consistent with input load waveform.Illustrate that cement base piezoelectric composite material sensor all can effectively monitor different frequency cyclic loading, show good sensing characteristics.
In a word, no matter reinforced concrete soil stress in-situ monitoring method of the present invention is in reinforced beam or in reinforced concrete frame structure, stress test under different loading environment dynamic load functions has all been shown to excellent monitoring effect, be of very high actual application value.
Claims (3)
1. a reinforced concrete structure stress original position on-line monitoring method, it is characterized in that, sensor is embedded in concrete component, sensor electrical extreme direction is consistent with surveyed stress direction, for converting concrete STRESS VARIATION to electric signal, sensor connects stress monitoring system by shielding line, and stress monitoring system is used for recording stress monitoring information.
2. reinforced concrete structure stress original position on-line monitoring method according to claim 1, is characterized in that, sensor is flush type 1-3 type cement base piezoelectric ceramic composite sensor.
3. reinforced concrete structure stress original position on-line monitoring method according to claim 1, is characterized in that, stress monitoring system is the electrical signal collection system of the U.S. NI-USB6008 of En Ai company data collecting card.
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| CN109696263A (en) * | 2019-02-21 | 2019-04-30 | 广西大学 | A kind of device and test method for testing the existing stress of concrete |
| CN111765997A (en) * | 2020-07-22 | 2020-10-13 | 中铁二十三局集团第二工程有限公司 | Incremental launching beam monitoring and controlling construction method |
| CN116296014A (en) * | 2023-05-18 | 2023-06-23 | 北京市建筑工程研究院有限责任公司 | Device and method suitable for effective prestress equivalent nondestructive testing of existing structure |
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| CN105334315A (en) * | 2015-10-19 | 2016-02-17 | 中冶建筑研究总院有限公司 | Measuring method of temperature shrinkage stress of mass concrete structures |
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| CN109297865A (en) * | 2018-10-09 | 2019-02-01 | 山西省交通科学研究院 | A kind of measuring method of the early age structural stress of Cement Concrete Pavement Slab |
| CN109297865B (en) * | 2018-10-09 | 2021-03-23 | 山西省交通科学研究院 | Method for measuring early-age structural stress of cement concrete pavement slab |
| CN109696263A (en) * | 2019-02-21 | 2019-04-30 | 广西大学 | A kind of device and test method for testing the existing stress of concrete |
| CN111765997A (en) * | 2020-07-22 | 2020-10-13 | 中铁二十三局集团第二工程有限公司 | Incremental launching beam monitoring and controlling construction method |
| CN116296014A (en) * | 2023-05-18 | 2023-06-23 | 北京市建筑工程研究院有限责任公司 | Device and method suitable for effective prestress equivalent nondestructive testing of existing structure |
| CN116296014B (en) * | 2023-05-18 | 2023-09-05 | 北京市建筑工程研究院有限责任公司 | Device and method suitable for effective prestress equivalent nondestructive testing of existing structure |
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| CN104111131B (en) | 2017-01-25 |
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